Opaque copy projector



March 5, 1946.

' w. E. scHwANHAussER OPAQUE COPY PROJECTOR Filed Maz ch 14, 1945 3Sheets-Sheiet 1 WA arm 5. 6

INVENTOR.

' I ATTORNEX CHIVANHAU$SER OPAQUE COPY PROJECTOR Filed March 14 1945 sSheets-Sheet 2 V IN VEN TOR. M4TER5cHwA-HAussR A TTOR/VE X March 5,1946. w. E. SCHWANHAUSSER 2,395,975

OPAQUE COPY FRO JECTOR I Filed Marbh 14, 1945 s Sheets-Sheet s I N V ENTOR. WA L TE]? 5 Sam/A NIL/A (/5551? 4 T TORNE Y.

; copy and thus'being projected.

Patented Mar. 5, 1946 UNITED STATES PATENT OFFICE OPAQUE ooPY PROJECTORWalter E Schwanhau'sser; Maplcwocd, N; .I assignor to -CharlesBeselerCompany, New York,

N. 35., apartnership- Application March=14, 1945, Serial No. 582;63"3

" "1 Claims; (CI. 88 24);

Theinvention relates toima'ge projection-ap paratus, more" especiallyofthe nature wherein the image projected is from opaque copy illu'minated' by a beam of light impinging thereon from a' suitable source fillumination.

In apparatus of this type; it is the practice" generally to locate thecopy upon a level (horizorital')- surface which supports, also; the.apparatus comprising a housing provided withan aperture or window atthe" bottom and withre spect to which the copy is to bejuxtaposed. or,in some forms, the copy is juxtaposed to an aper ture' located in avertical rear wall without provi sion'of a mirror for illumination ofthe copy.

These constructions of apparatus; aside from the inconvenience in'positioning copy'ior projection, involve a bulky and unnecessarilyextended housing for accommodating the source of illumination with itsreflector, as well as the projecting. lens. Also, with sometypes', theimageproe jected thereby isireversed or in a -right-left position.

It is an object of the present'invention' to" pro-.

vide projection apparatus of the nature set forth in which the,copy-receivingaperture is most accessible, enabling copy to be quicklyand, accu rately positioned thereover. V I

Another object of the invention is to provide a reflection system whichwill admitof construct-' ing a projection apparatus of compact andreadilyportable form.

Still another object or the invention isto facili- A still furtherobject of the; invention is to "so" locate the source, ofilluminationwith" respect.

to the opaque co y, a's'in lose proximity thereto, that maximum.illumination of the latter is secured. V V 7 Another object" of theinvention" is to reverse the direction of the light beam from the sourceof illumination. prior to its" reflection into the proj'ectinglens'. I

The invention has for" an object, also, toiintercept or screen thefilament section of an electric lamp; constituting the source ofillumination, against its image appearing on the illuminated housing isprovided for the various elements, and

. In carrying out the invention, an enclosing.

it" is specially constructed to insure compactness and simplicity ofoperation of the projector. To this end, the walls of the housing aregenerally oflrectangular shape and are arranged horizom tally andvertically with respect" to one another except for the upper portion of"the front-or projection wall portion which recedes inwardly or isinclined toward the rear to meet the top wall. The latteris providedwith a ventilation outletor opening located immediately over the sourceof illumination-an electric lamp. This lamp, inaccordance with theinvention, is tobe sup-- ported in the housing and in an uprightor'erec't position which is the mostsuitable one to promote convectionof the heat developed by the lamp during operation of the projector, andto insure a" much longer useful life of said lamp.

Behind the lamp and between it and the rear wall of the housing islocated a reflector which is positioned coaxially with a copy-receivingaperture or window provided in the said upper inclined portion of thefront wall'. This reflector is designed to reflect a beam of light fromthe lamp horizontally toward the said aperture to illuminate properlycopy placed thereon; and provision is made to intercept or screen thefila' merit-section of said lamp so that nolmage thereof will appear onthe copy and its projected image. i

t From the copy; supported in inclined positionover said aperture and,preferably, at anangle 01 4'5 degrees'to' the front wall (verticall',the light rays (copy) are picked up downwardly, in a" directiongenerally reverse to the copy impinging raysas' reflected-from the lamp;bya second reflector or mirror mounted in the lower portion of thehousing and positioned at an angle of 22 degrees to the vertical. Thismirror isdesigned to reflect the; copy image rays substantially parallelto the original rays from the lamp, as. reflected by the first-namedreflector, and in the same direction. These further reflected rays thenpass through an objective lens having its barrel mounted adjustably inthe lower and'vertical portion ofthe said front wall so as to beconveni'ently accessible for focussing the image of the copy" onasuitable screen, as is well und'er-- stood. f The nature of theinvention, however, will best be understood when described in connectionwith 1 the accompanying drawings, in which:

projector, taken on the lines-'4,- Fig. 2 or the objective lens I B ofthe projector.

drawings, and looking in the direction of the arrows.

Referring to the drawings, a housing for the various optical elements ofthe projector is constructed, for example, of more or less rectangularwalls, preferably of sheet metal or other suitable material. Thus, abottom It! is provided having feet for supporting the housing as awhole, and from this bottom side walls II and I 2 extend upwardly to atop piece or cover l3. A rear wall I4 is also provided to close thehousing at the rear and over the top edge of which the cover I3 ishinged; and a front wall 15 extends upwardly from the bottom lvertically for a distance sufficient to accommodate the The said frontwall then is inclined rearwardly as at l5, preferably at an angle of 45degrees to the vertical, to meet the top wall [3 which overlaps it.

This rearwardly-directed wall portion I5 is provided with a window orcop -receiving aperture l'l bounded along the top and bottom edges byrespective copy-holding guides l8 and I9 into which the copy to beprojected is conveniently slid and removed manually. The copy to beprojected is preferably mounted in a backing slide or carrier member 29to this end, the said member being designed to be introduced into andwithdrawn with copy into the holding guides. A handle 2| attached to thefront wall portion l5, by a pair of uprights of a bracket 22 immediatelyabove the upper guide I8, serves in positioning the projectors and fortransporting the same manually.

At the rear of said housing and in the upper portion thereof, there ismounted a suitable source of illumination such, for example, as theelectric, concentrated-filament projecting lamp 25. The mounting may beconveniently effected by means of a bracket 26 attached to one of theside walls H and I2, in the embodiment shown the wall II; and themounting is such that the said lamp will be maintained in an erectposition (vertical) terminating slightly below the top wall l3. Thelatter is provided with a relatively large opening 21 in thelongitudinal axis of said lamp, and there is interposed between theopening 21 and the upper end of the lamp a light baffle 28 in the natureof plate or cover hinged'to the inner face of the rear 'Wall M. Thebaffle 28 is provided with a small opening 28' in the longitudinal axisof the lamp and insures against undue leakage of light exteriorly of thehousing but at the same time permitting adequate ventilation throughsaid openings, being particulary effective in this respect since the tipof the lamp is located in such close proximity thereto.

Behind the said lamp 25 is located a parabolic reflector 29 designedtoreflect light rays from the lamp toward the copy-receiving aperture Hwith which it is coaxial. The reflector is conveniently mounted in thehousing by supportingits lower edge on inturned shelves 30,-of a pair ofchannel members 3| attached oppositely to the respective side walls, andguiding said reflector in vertical guides 32 of the respective members.The upper edge of the reflector is adapted to be held against verticaldisplacement by contact with the under side of the hinged light baffle28.

.To prevent animage of the filament of lamp 25 from appearing onthe copywhen a light beam is directed by the reflector 23 horizontally towardcopy positioned over the aperture ll,

. thereof.

an opaque member such as the metal plate 33 is provided in front of thelamp over a portion thereof sufficient to screen out its concentratedfilament section; and this screen is mounted on a bracket 34 secured tothe side wall I l.

A downward extension of the said bracket 34 is designed to support inthe lower rear portion of the housing below the lamp 25 a plane mirror35 which will thus be located at a cool portion The said mirror ispositioned, preferably,- at an angle of 22% degrees to the vertical topick up illuminated copy supported over the aperture 11 and to reflectit horizontally and substantially parallel to the originally reflectedrays from the source of illumination or lamp 25. The beam of light thusreflected by the said mirror 35 is coaxial with the projecting lens 16mounted in the vertical portion l5 of the front wall. A secondaryreflector element 39 may be attached to the inner face of wall portion[5' to intensify the illumination of the lower portion of said copywhich is further removed from the lamp than the upper portion.

To admit of convenient axial adjustment of the lens for focussing theprojected image, the lens may be mounted. ithin a cylindrical guide 36directed inwardly from the inner face of wall [5, and a spiral slot 3!is provided in the cylindrical guide to cooperate with a pin 38projecting outwardly from the periphery of the lens barrel whereby thelens will be advanced or retracted as desired when manually turned.

In the operation of the novel projector, reference being had to Fig. 3of the drawings and wherein the paths of the light rays are indicated bybroken lines, it will be noted that the beam of light from the lamp 25will impinge on the copy to illuminate the same. The illuminated areaofthis copy isthen imaged in the lower mirror 35 reversely (right-left)and upside down, the copy having been mounted in its carrier 20 in suchupside-down position. This image is, therefore, in such a position thatthe objective lens l6 produces an image, when projected, which is rightside up and in correct left-right relationship conforming to theoriginal copy.

I claim:

1. A projector for projecting images from opaque copy, comprising ahousing with front wall rearwardly inclined at the upper portion andprovided with a copy-receiving aperture, the lower portion of said frontwall being substantially vertical, a projecting lens mounted in the saidvertical portion of the front wall for axial adjustment, a verticallydisposed projecting lamp mounted within the upper rear portion of thehousing, a reflector disposed in the housing behind said lamp coaxiallywith the copy-receiving aperture to reflect light rays theretohorizontally from said lamp, and a mirror mounted in the lower rearportion of the housing to receive angularly in a reverse direction raysof light from i1- luminated copy retained over the copy-receivingaperture and adapted to direct the rays parallel to the first-namedreflection and in the optical axis of and toward the said projectionlens.

2. The projector as claimed in claim 1, wherein the lamp is an electric,concentrated filament lamp, and an opaque screening means is associatedwith the said lamp in closeproximity thereto to intercept direct rays oflight therefrom in the direction of reflection by the reflector and ofthe lamp filament.

3. The projector as claimed in claim 1, wherein the upper portion of thefront wall is inclined at an angle of 45 degrees to the vertical, the

lamp is a vertically disposed electric lamp with the reflectorvertically disposed behind the same, and the mirror is disposed at anangle of 22 degrees to the vertical.

4. The projector as claimed in claim 1, wherein a cover top for thehousing is hinged to the upper edge of the rear wall of the housing andis provided with a ventilation opening in the 1ongitudinal axis of saidlamp, and a light baflle is hinged to the inner face of the rear wallofthe housing to swing over the top of the lamp between it and theopening of said cover top.

5. The projector as claimed in claim 1, wherein a cover top for thehousing is hinged to the upper edge of the rear wall of the housing andis provided with a ventilation opening in the longitudinal axis of saidlamp and a light bafile is hinged to the inner face of the rear wall ofthe housing to swing over the top of the lamp between it and the openingof said cover top and is provided with a relatively small opening in thelongitudinal axis of said lamp.

6. The projector as claimed in claim 1, wherein the reflector for thelamp is retained by channel members attached to opposite side walls ofthe housing having respective shelves for sup- 7. A projector forprojecting images from opaque copy, comprising a housing with front wallrearwardly inclined at the upper portion at an angle of 45 degrees tothe vertical and provided with a copy-receiving aperture, the lowerportion of said front wall being substantially vertical, a projectinglens mounted in the said vertical portion of the front wall for axialadjustment, a vertically disposed electric, concentrated-filamentprojecting lamp mounted within the upper rear portion of the housing, areflector disposed in the housing behind said lamp coaxially withporting the lower rim portion of said reflector and with lateral guidesfor the rim, a cover top for the housing is hinged to the upper edge ofits rear wall and is provided with a ventilation opening in thelongitudinal axis of said lamp, and a light bafile is hinged to theinner face of the said rear wall to swing over the top of the lampbetween it and the opening of said cover top for engagement with theupper rim portion of the said reflector.

the copy-receiving aperture to reflect light rays thereto horizontallyfrom said lamp, an opaque screening means associated with the said lampin close proximity thereto to intercept direct rays of light therefromin the direction of reflection .by said reflector and of the lampfilament, a cover top for the housing hinged to the upper edge of itsrear wall and provided with a ventilation opening in the longitudinalaxis of said lamp, a light bafile hinged to the inner face 'ofthe rearwall to swing over the top of the lamp between it and the opening ofsaid'cover top and provided with a relatively small opening in thelongitudinal axis of said lamp, and a mirror mounted in the lower rearportion of the housing at an angle of 22 degrees to the vertical toreceive rays of light angularly in a reverse direction from illuminatedcopy retained over the copy-receiving aperture and adapted to directrays parallel to the first-named reflection and in the optical axis ofWALTER E. SCHWANHAUSSER.

